I’ve never used it with my Zorki 4, the thread title is a bit of a red herring, but it was the inspiration.
My Bessa R was the body I used it on.
The scale focussing on a RF body is frustrating to start with but not too bad.
Not having a 24mm viewfinder, that’s hard. The extent of the Bessa Viewfinder is reportedly the view of a 28mm lens. My method of approximation was to put the viewfinder up to my eye check the 28mm view looked good, then roll my head from side to side and I assumed the extra view would be close to 24mm. It was close, only got a few surprise elements at the edge of the frame.
The SLR lens being a bit bigger than its RF counterparts also meant that I never got any of my fingers in the way.